Boiler



June 26, 1934. c. A. oLsoN Er AL BOILER Filed June 8. 1952 2 Sheets-Sheet l June 26, 194. c. A. oLsoN ET AL BOILER Filed June 8, 1932 2 Sheets-Sheet 2 Patented June 26, 1934.

UNITED STATES PATENT OFFICE Application June 8, 1932, Serial No. 615,964

2 Claims.

This invention relates to boilers suitable for steam or hot water and is particularly applicable to sectional boilers of the vertical section type shown in the Olson Patent No. 1,856,355, issued May 3, 1932, upon which this invention is an improvement.

There is a general tendency of boilers or furnaces to discharge clouds of smoke and/or gases, burned and unburned, through the re door when the latter is opened, particularly when replenishing fuel. This discharge is particularly noticeable under adverse draft conditions and where a poor grade of fuel is being burned. The condition is not only unpleasant and injurious to the health but ineiiicient in that the gases thus emitted are incompletely burned and are lost before they have traversed all of the fiue passages of the furnace.

It is the purpose of this invention to eliminate this discharge of smoke and gases through the fire door and to facilitate the burning of poor grades of free burning bituminous fuel.

Further objects and their resultant advantages will be apparent from the following description given in connection with the drawings, in which: f

Fig. 1 is a longitudinal Vertical section, taken on line 1-1 of Figs. 2 and 4, of a four section boiler constructed in accordance with this invention,

Fig. 2 is a rear elevation of the front section,

Fig. 3 is a horizontal section through the front section taken on line 3-3 of Fig. 2,

Fig. 4 is an end elevation of the second section or first intermediate section of the boiler, and

Fig. 5 is a transverse section of the intermediate section taken on line 5 5 of Fig. 4.

For purposes of illustration the boiler has been shown as a four vertical section boiler comprising a front section 1, a second section 01 iirst intermediate section 2, a second intermediate section 3 and a rear section 4. Each of the sections is provided with a pair of side vertical water legs 5 in communication with each other at their lower ends through connections 6 (Fig. l) and at their upper ends through connecting passages 7. The water legs communicate adjacent their upper ends with an upwardly arched water channel 8 and with two side passages or channels 9 leading tothe upper water chamber 10, the latter water chambers being in communication with each other through interconnections 7. The arched water channel S communicates at its center with the stem 11 of a Y-like water channel having two outwardly and upwardly inclined arms 12 which communicate with the side channels 9 and thence into the upper channel l0. The flow of water in the water passages is indicated by the dotted arrows in Figs. 2 and 4.

The legs and upwardly arched channel 8 define the fire boX 1 3 at the bottom of which are the saddles 14 which carry the fire grates, not shown.

As in the prior Olson patent the main body of products of combustion passes upwardly and rearwardly as indicated by the solid line arrows, Fig. 1, impinges the upper wall of the fire box formed by the lower wall of the water chamber 8 and passes upwardly at the rear end of the furnace into two horizontal flue ducts or chambers 16 of the second and third sections disposed between the arched water chamber 7 and the arms 12, and through a pair of somewhat similar ducts 17 in the first section. The water arms 12 of the first section are restricted in depth to provide Vertical flue passages 18 and 19 to permit the flue gases to enter the upper flue chamber 21 of the first section and from which the flue gases pass rearwardly through similar chambers 22 in the intermediate and rear chambers and to a suitable stack, not shown.

To prevent the discharge of smoke and other gases through the fire door opening 23, the latter is provided with an arcuate baie or partial partition 24 to retain the gases therebehind. The baiiie is deepest at the corners or sides adjacent the water legs where the formation and collection of gases is greatest, due to contact with the relatively cooler water column walls. A relief for these gases, to provide an escape therefor to further prevent their discharge through the fire door, is provided in the front section by coring the casting to form side cut-aways or depressions 26 which result in two side ports or passages communicating with the passage 19 and thence with passage 22 for the ue gases. The second section or first intermediate section is also formed with a central cutaway or depression 27 upon each side, which provides additional ducts or passages at each side of the first intermediate section. Duct 27 which is opposed to the first section overlaps the depression 26 and establishes communication between the re box and chamber 16 through passage 19, both at the center of the section and where the depressions overlap, whereas the duct 27 opposed to the third section establishes communication with passage 16 through the center only of the section. The baffle 24 thus pockets the gases and prevents their escape through the fire door, whereas the ports formed by cutaway portions 26 and 27 provide a relief or escape for these gases into the upper nue chambers.

The foregoing provisions substantially eliminate any pufiing or discharge of smoke or products of combustion from the re box through the re door and furthermore provide for complete combustion and utilization or these gases in the normal flue passages, thus increasing the efficiency of the boiler as well as making it possible to effectively burn very poor fuel such as poor bituminous coal even under adverse draft conditions.

It will be apparent that the novel features of our invention are applicable to other styles and types of boilers than that shown for purposes of illustration, and that minor changes may be made in the details of construction given without departing from the spirit and scope of our invention as defined in the appended claims.

We claim:

l. In a vertical sectional boiler, a plurality of vertical sections adapted when assembled to provide a fire box and a substantially horizontal flue passage above and communicating with the top of the re box at the rear end of the latter, the rear end section being provided with an upwardly and forwardly inclined wall for directing the flue gases from the re box into the flue passage, one of the rst two sections being further' formed with a restricted centrally disposed communicating flue duct between the fire box and said flue passage adjacent the front end of the nre box, and a baille extending downwardly from the top of the re box between the re door and said latter duct, said baille being deeper at its sides than at its center.

2. In a vertical sectional boiler, a plurality of vertical sections adapted when assembled to provide a re box and. a pair of substantially horizontal flue passages above and communicating with the top of the fire box at the rear end thereof and extending to the front of the boiler proportioned for evacuating the bulk of the products of combustion from the ire box, the front section being further formed to provide through it a pair of restricted vertical flues adjacent the second Vertical section near the front top corner portions of the lire box extending therefrom to said horizontal lues, and a baille extending downwardly from the re box ceiling spaced forwardly from said vertical lues, said baffle being deepest at the re box corners in front of said flues and shallower along its middle.

CHARLES A. OLSON. JOHN P. MAGOS. 

